package com.shuai.gulimall.product.service.impl;

import com.shuai.common.utils.PageUtils;
import com.shuai.common.utils.Query;
import com.shuai.gulimall.product.service.CategoryBrandRelationService;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;

import com.shuai.gulimall.product.dao.CategoryDao;
import com.shuai.gulimall.product.entity.CategoryEntity;
import com.shuai.gulimall.product.service.CategoryService;
import org.springframework.transaction.annotation.Transactional;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Autowired
    private CategoryBrandRelationService categoryBrandRelationService;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {

        // 1、查询出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);
        // 2、组装成父子的树形结构

        // 2.1)、找到所有一级分类
        List<CategoryEntity> level1Menus = entities.stream()
                .filter(e-> e.getParentCid() == 0)
                .map((meau) -> {
                    /*
                     meau: 当前菜单
                     entities: 所有的菜单
                    */

                    meau.setChildren(getChildrens(meau,entities));
                    return meau;
                })
                .sorted((menu,menu2)->{
                    return (menu.getSort() == null ? 0 : menu.getSort()) - (menu2.getSort() == null ? 0 : menu2.getSort());
                })
                .collect(Collectors.toList());  // 以集合的形式收集数据


        return level1Menus;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        // TODO  1、检查当前删除的菜单，是否被别的地方引用
        baseMapper.deleteBatchIds(asList);
    }

    @Override
    public Long[] finCatelogPath(Long catelogId) {
        ArrayList<Long> paths = new ArrayList<>();
        List<Long> parentPath = findParentPath(catelogId, paths);

        Collections.reverse(parentPath);

        return parentPath.toArray(new Long[parentPath.size()]);
    }

    /**
     * 级联更新所有关联数据
     * @param category
     */
    @Transactional
    @Override
    public void updateCascade(CategoryEntity category) {
        this.updateById(category);
        categoryBrandRelationService.updateCategory(category.getCatId(),category.getName());

    }

    // 225,25,2
    private List<Long> findParentPath(Long catelogId, ArrayList<Long> paths) {
        // 1、收集目前节点id
        paths.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);
        if (byId.getParentCid()!=0){
            findParentPath(byId.getParentCid(),paths);
        }
        return paths;
    }


    // 递归查找所有菜单的子菜单
    private List<CategoryEntity> getChildrens(CategoryEntity root,List<CategoryEntity> all){
        List<CategoryEntity> children = all.stream().filter(categoryEntity ->{
            return categoryEntity.getParentCid().equals(root.getCatId());
        }).map(categoryEntity -> {
            // 1、找到子菜单（递归）
            categoryEntity.setChildren(getChildrens(categoryEntity,all));
            return categoryEntity;
        }).sorted((menu,menu2)->{
            // 2、菜单的排序
            return (menu.getSort() == null ? 0 : menu.getSort()) - (menu2.getSort() == null ? 0 : menu2.getSort());
        }).collect(Collectors.toList());

        return children;
    }

}